Oral isotretinoin is the best treatment for patients with moderate acne in whom antibiotics are unsuccessful and for those with severe inflammatory acne. Dosage of isotretinoin is usually 1 mg/kg once/day for 16 to 20 wk, but the dosage may be increased to 2 mg/kg once/day.
Lots of different predators will prey upon other predators: Golden eagles are well known predators of smaller hawks. Collared lizards will eat other lizards. Crocodilians will feed on other predators, such as monitor lizards, snakes and even lions that come to the water to drink. Many snakes will eat other snakes. Some frogs, like the horned frogs of South America and the African bullfrog, readily feed on other frogs.
While many creatures snack on snakes as a side dish, few predators eat only snakes. The exceptions are some birds of prey and snakes which eat snakes! Birds are major snake predators: not just birds of prey but also little itty bitty birds which eat baby snakes. Some birds specialise in snakes: The Secretary Bird worries a snake to death, dancing around it, stomping on it and throwing it up in the air until it dies. The Road Runner also eats snakes.